SKM 2021 – scientific programme
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DS: Fachverband Dünne Schichten
DS 10: Focus Session: Highlights of Materials Science and Applied Physics III (joint session DS/HL)
DS 10.1: Talk
Friday, October 1, 2021, 11:15–11:30, H1
Free-Standing ZnSe-Based Microdisk Resonators - Influence of Edge Roughness on the Optical Quality and Degradation Reduction with Supported Geometry — •Wilken Seemann1, Alexander Kothe1, Christian Tessarek1, Gesa Schmidt2, Siqi Qiao2, Nils von den Driesch2, Jan Wiersig3, Alexander Pawlis2, Gordon Callsen1, and Jürgen Gutowski1 — 1Institute of Solid State Physics, University of Bremen, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — 3Institut für Physik, Universität Magdeburg, Germany
Free-standing microdisks with ZnCdSe quantum wells in ZnMgSe barriers are analyzed using micro-photoluminescence (μPL). Stimulated emission into whispering gallery modes (WGMs) is demonstrated. Deformation functions of the resonators are determined via scanning electron microscopy (SEM). A correlation between edge roughness and optical quality is found. These results are confirmed by calculations based on the boundary element method using the measured deformation functions.
To reduce degradation in the ZnSe structures a fabrication technique new to this material system is introduced. It yields "supported" disks with no underetching which enhances the mechanical stability of the resonator and its thermal contact to the substrate. SEM measurements reveal an excellent structural quality of these resonators. The formation of WGMs in supported ZnSe:Cl resonators is demonstrated in μPL and confirmed by theoretical calculations.